Effect of leaching conditions on the elution of metals from denitration catalyst wastes

• Published in: International journal of modern physics. B, Condensed matter physics, statistical physics, applied physics Vol. 32; no. 19; p. 1840062
• Main Authors: Yabutani, Tomoki, Nakamura, Takamasa, Takayanagi, Toshio, Yamada, Yohei
• Format: Journal Article
• Language: English
• Published: Singapore World Scientific Publishing Company 30.07.2018; World Scientific Publishing Co. Pte., Ltd
• Subjects: Catalysis; Catalysts; Denitration; Elution; Hydrogen peroxide; Leaching; Materials Processing, Properties and Applications; Sodium; Sodium carbonate; Titanium; Titanium dioxide; Rare metals; leaching; sodium percarbonate; denitration catalyst
• DOI: 10.1142/S0217979218400623
• ISSN: 0217-9792

Leaching of metallic species from denitration catalyst waste was performed at different leaching conditions using different solvents. The leaching efficiency of sodium percarbonate solution was higher than that of hydrogen peroxide (H2O2) or sodium carbonate solution. Under the optimal leaching conditions (1.0 mol kg − 1 sodium percarbonate, leaching temperature of 80 ∘ C and leaching time of 5 h), the leaching rate was 90.7 ± 2.9% for W, 78.4 ± 4.1% for V and 8.6 ± 0.4% for Ti. The enhanced leaching ability of sodium percarbonate was due to the high affinity of the peroxo moiety (–O–O–) of H2O2, within the percarbonate, towards metallic ions and dissolution of titanium dioxide (TiO2) in the alkaline medium of carbonate.